18243 has 6 divisors (see below), whose sum is σ = 26364. Its totient is φ = 12156.

The previous prime is 18233. The next prime is 18251. The reversal of 18243 is 34281.

It is a happy number.

It is not a de Polignac number, because 18243 - 2⁵ = 18211 is a prime.

18243 is a modest number, since divided by 243 gives 18 as remainder.

It is not an unprimeable number, because it can be changed into a prime (18223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1005 + ... + 1022.

It is an arithmetic number, because the mean of its divisors is an integer number (4394).

2¹⁸²⁴³ is an apocalyptic number.

18243 is a deficient number, since it is larger than the sum of its proper divisors (8121).

18243 is a wasteful number, since it uses less digits than its factorization.

18243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2033 (or 2030 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 18243 is about 135.0666502139. The cubic root of 18243 is about 26.3248205495.

Subtracting from 18243 its sum of digits (18), we obtain a square (18225 = 135²).

It can be divided in two parts, 182 and 43, that added together give a square (225 = 15²).

The spelling of 18243 in words is "eighteen thousand, two hundred forty-three".